/**
 * Page Transition Effects CSS
 * Modern transitions with fallback support - Fade Only
 */

/* View Transitions API Support */
@view-transition {
    navigation: auto;
}

/* Custom view transition names for different elements */
.page-header {
    view-transition-name: page-header;
}

.page-content {
    view-transition-name: page-content;
}

.site-navigation {
    view-transition-name: site-navigation;
}

/* Fallback animations for browsers without View Transitions API */
.page-transitioning-out {
    overflow: hidden;
}

.page-transitioning-out main {
    transition: opacity 500ms ease;
    will-change: opacity;
    backface-visibility: hidden;
}

.page-transitioning-in main {
    transition: opacity 500ms ease;
    will-change: opacity;
    backface-visibility: hidden;
}

/* Transition overlay styles with Enhanced GPU Acceleration */
#page-transition-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 9999;
    pointer-events: none;
    will-change: opacity, transform;
    transform: translateZ(0);
    backface-visibility: hidden;
    contain: layout style paint;
    isolation: isolate;
    perspective: 1000px;
    /* Enhanced composite operations */
    mix-blend-mode: normal;
    /* GPU layer promotion */
    filter: brightness(1);
}

#page-transition-overlay.active {
    pointer-events: all;
    opacity: 1 !important;
}

#page-transition-overlay.active .transition-loader {
    opacity: 1;
}

/* Enhanced Fade transition effects with GPU optimization */
.fade-transition-out main {
    opacity: 0;
    transform: scale3d(0.98, 0.98, 1);
    will-change: opacity, transform;
    backface-visibility: hidden;
    /* Enhanced GPU acceleration */
    filter: brightness(0.95);
    isolation: isolate;
    contain: layout style paint;
    perspective: 1000px;
}

.fade-transition-in main {
    opacity: 1;
    transform: scale3d(1, 1, 1);
    will-change: opacity, transform;
    backface-visibility: hidden;
    /* Enhanced GPU acceleration */
    filter: brightness(1);
    isolation: isolate;
    contain: layout style paint;
    perspective: 1000px;
}

/* Enhanced loading states */
.page-loading {
    position: relative;
}

.page-loading::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, 
        transparent 0%, 
        #DA2974 50%, 
        transparent 100%);
    z-index: 10000;
    animation: loading-bar 2s infinite;
}

@keyframes loading-bar {
    0% {
        transform: translateX(-100%);
    }
    100% {
        transform: translateX(100%);
    }
}

html.page-transitioning {
    overflow: hidden;
}

/* Link hover effects during transitions */
a {
    transition: all 0.2s ease;
}

a:hover {
    transform: translateY(-1px);
}

.page-transitioning a {
    pointer-events: none;
}

/* Form transition effects */
.form-transitioning {
    transition: all 0.3s ease;
}

.form-transitioning input,
.form-transitioning select,
.form-transitioning textarea {
    transition: all 0.3s ease;
}

/* Enhanced Page-specific transition customizations with Advanced GPU Optimization - Fade Only */
.single-product .page-transitioning-out main,
.woocommerce-cart .page-transitioning-out main,
.woocommerce-checkout .page-transitioning-out main,
.home .page-transitioning-out main {
    opacity: 0;
    transform: scale3d(0.98, 0.98, 1);
    will-change: opacity, transform;
    backface-visibility: hidden;
    /* Advanced GPU optimization */
    filter: brightness(0.95);
    isolation: isolate;
    contain: layout style paint;
    perspective: 1000px;
    /* Composite operations optimization */
    mix-blend-mode: normal;
}

.single-product .page-transitioning-in main,
.woocommerce-cart .page-transitioning-in main,
.woocommerce-checkout .page-transitioning-in main,
.home .page-transitioning-in main {
    opacity: 1;
    transform: scale3d(1, 1, 1);
    will-change: opacity, transform;
    backface-visibility: hidden;
    /* Advanced GPU optimization */
    filter: brightness(1);
    isolation: isolate;
    contain: layout style paint;
    perspective: 1000px;
    /* Composite operations optimization */
    mix-blend-mode: normal;
}

/* Enhanced Mobile optimizations with Advanced Performance Focus */
@media (max-width: 768px) {
    .page-transitioning-out main,
    .page-transitioning-in main {
        transition-duration: 250ms;
        transition-timing-function: ease-out;
        /* Mobile GPU optimization */
        will-change: opacity;
        transform: translateZ(0);
        backface-visibility: hidden;
    }
    
    /* Enhanced mobile performance optimization */
    #page-transition-overlay {
        contain: strict;
        isolation: isolate;
        /* Mobile GPU acceleration */
        perspective: 1000px;
        mix-blend-mode: normal;
        filter: brightness(1);
    }
    
    /* Mobile-specific GPU optimizations */
    .page-transitioning main {
        will-change: opacity;
        contain: layout style paint;
        transform: translateZ(0);
        backface-visibility: hidden;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    .page-transitioning-out main,
    .page-transitioning-in main,
    #page-transition-overlay,
    #page-transition-overlay * {
        transition: none !important;
        animation: none !important;
        will-change: auto !important;
        transform: none !important;
        filter: none !important;
    }
    
    .no-page-transitions .page-transitioning-out main,
    .no-page-transitions .page-transitioning-in main {
        transform: none !important;
        opacity: 1 !important;
        will-change: auto !important;
    }
}

/* High contrast mode */
@media (prefers-contrast: high) {
    #page-transition-overlay {
        background: #000 !important;
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    #page-transition-overlay {
        background: rgba(26, 26, 26, 0.95) !important;
    }
    
    .page-loading::before {
        background: linear-gradient(90deg,
            transparent 0%,
            #ff6b9d 50%,
            transparent 100%);
    }
}

/* Focus management during transitions */
.page-transitioning :focus {
    outline: none;
}

.page-transitioning-in :focus-visible {
    outline: 2px solid #DA2974;
    outline-offset: 2px;
}

/* Intersection with other animations */
.page-transitioning .lazy-loading,
.page-transitioning .animate-on-scroll {
    animation-play-state: paused;
}

/* Enhanced Performance optimizations with Advanced GPU acceleration */
.page-transitioning {
    contain: layout style;
    isolation: isolate;
    /* Enhanced GPU optimization */
    perspective: 1000px;
    mix-blend-mode: normal;
}

.page-transitioning main {
    will-change: opacity, transform;
    contain: layout style paint;
    /* Advanced GPU acceleration */
    filter: brightness(1);
    isolation: isolate;
    perspective: 1000px;
    transform: translateZ(0);
}

.page-transitioning-complete main {
    will-change: auto;
    contain: none;
    /* Reset GPU optimizations */
    filter: none;
    transform: none;
}

/* Enhanced GPU layer promotion for critical elements */
.page-transitioning header,
.page-transitioning footer,
.page-transitioning .site-content {
    transform: translateZ(0);
    backface-visibility: hidden;
    /* Additional GPU optimization */
    will-change: transform;
    isolation: isolate;
    contain: layout style paint;
    perspective: 1000px;
}

/* Loading spinner variations */
.transition-loader.dots::after {
    content: '⚬ ⚬ ⚬';
    animation: dots-pulse 1.5s infinite;
    letter-spacing: 4px;
}

@keyframes dots-pulse {
    0%, 20% { opacity: 0; }
    50% { opacity: 1; }
    80%, 100% { opacity: 0; }
}